[bestgenman]

Every situation is different with the wide assortment of electronics but from experience (my own) , the generator alternator regulator would turn off when the inverter/charger peaked the battery voltage and as soon as the inv/chg turned off the voltage would fall low enough to turn the alternator regulator back on before the inv/chg. The end result was a cyclical on-off sequence that you could easily see in the 12V lighting. I unplugged the alternator excite wire and let the inv/chg do all the house battery charging. My gen was connected to house batteries.

Another experience was when the gen was connected to the engine batts and both alternators were charging if the gen was running while the main engine was running. That scenario took out the main eng alt regulator as both regulators were trying to control voltage.